Inductance



' S. KUPKA INDUCTANCE Filed July 25. 1925 Patented Aug. 2, 1927. I

' UNITED STATES PATENT I OFFICE.-

s'rmm mxa, or cmcaeo, rumors nrnuc'rurcn.

Application ma Jul 25,1923. Serial 30. 48,007.

is so arranged as to minimize the effective electromagnetic field aboutthe inductance, whereby two or moreof rthe inductan'ces constructed inaccordance with myjinven tion, ma be placed in close proximity with oneanother, regardless of position, without 1 appreciably altering theinternal resistance of the inductance.

A further object of the invention is to provide an inductance of thecharacter described in which the internal capacity of W the inductanceis reducedto a minimum.

A further object of m invention is to provide a device of the c aracterdescribed which is simple in construction, compact in form, andthoroughly practical for the pur-.

2 pose intended.

Other objects and advantages. will appear in the followingspecification, and the novel features of the invention will beparticularly pointed out in the appended claim.-

, 7 to My invention is illustrated in theaccom;

panyings forming part of this application, in which 4 Figure 1 is aperspective view of an embodiment of my invention, and

85 .Figure 2 is a diagrammatic view illustrating the arrangement of thewinding of the inductance, Q

In carrying-out my invention I make use of a short tubular insulatingmember 1 upon 40 which the inductance is wound. This member is similarvin appearance and structure to the ordinary supporting member uponwhich the well known type of tuning coil employed in radio circuits iswound.

The winding of my im roved inductance consists of a single'gwvire avinga terminal 2 projected through an opening 3 adjacent to one end of themember 1. .The wire is wound dia nally across the outer surface of themem r as shown at 4, then through the central opening of the cylindricalmember, diagonally across the inner surface as shown at 5, and'back overthe edge upon the outer surface, whereupon the same arrangement iscarried out until the wirehas reached the point 6. This same arrangementis carried out to form a second disposition of the winding parallel tothe first. This is continued until the roper length of wire has beenwound in t 1e inductance. The 00 outermost end or opposite terminal 7 isprojected through an opening 8 at the opposite end from the opening 3and the entire device is emerged in insulating material, such as shellacor the like to hold the winding as in place. If it'is not desired toemploy a cementitious medium to hold the windings in place they may bewound sufiiciently tight to old without such medium. In Figure 2 I haveshown the arrangement of the winding, the succeeding turns to the firstbeing indicated at 9.

From the foregoing description of the various parts of the device theoperation thereof may be readily understood. Due to 15 the peculiar dissition of the turns upon the member 1, t e efi'ec'tive electromagneticfield about the device, is minimized. and two or more .of theinductances may be placed in close proximity with one another, regardsoless of the positions with respect to one another. without appreciablyimpairing the internal capacities or resistances of the severalwindings.

For this reason my im roved inductance as is especially well. adap foruse in radio circuits.

I claim:

An inductance comprising a tube formed of insulating material, and awire having 90. .one end project through an o eni'ng in said tube, saidwire being woun around said tube and having the other end projectthrough another'opening in said tube, the windings of said wire formingroups of 05 wire portions disposed diagonal y across the outer andinner surfaces of said tube, said groups being spaced apart.

STANLEY KUPKA.

